Calculate: C = pi times r.
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320. use a calculator. (:
The formula for circumference is Pi x D= Circumference. If you know the circumference you solve for the diameter as you would any other variable. Let's say the circumference is 10, the equation would then be: Pi (3.14) x D = 10. Solve for D. D= 10/3.14
0.0001
APEX: 46.47 - 46.5cm
They used the abacus